scholarly journals Creep Behaviour Under Compressive Stresses of Calcium and Barium Containing Mg-Al-based Die Casting Alloys

2013 ◽  
Vol 765 ◽  
pp. 69-73 ◽  
Author(s):  
Hajo Dieringa ◽  
Daniela Zander ◽  
Mark A. Gibson
Keyword(s):  
Creep Behaviour ◽  
Die Casting ◽  
Creep Tests ◽  
Alloying Additions ◽  
Casting Alloys ◽  
Compression Creep ◽  
Compressive Stresses ◽  
Property Evaluation ◽  
Pressure Die Casting ◽  
Applied Stresses

The development of creep resistant high pressure die casting (HPDC) alloys is one of the main focuses in magnesium research. Alloying elements like rare earths, calcium, strontium or scandium added to the necessary aluminium for die casting have already been introduced. Newly developed barium containing magnesium alloys with three levels of alloying additions were processed via HPDC and their compression creep response at 200 °C was evaluated. DieMag633 (Mg-6Al-3Ba-3Ca) displays the best creep resistance followed by DieMag422 (Mg-4Al-2Ba-2Ca) and then DieMag211 (Mg-2Al-1Ba-1Ca). Stress exponents from tests at different applied stresses were calculated. The creep tests were also accompanied by microstructural investigations and mechanical property evaluation.

Effect of Equal-Channel Angular Pressing (ECAP) on Creep in Aluminium Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 2904-2909 ◽  
Author(s):  
Vàclav Sklenička ◽  
Jiří Dvořák ◽  
Marie Kvapilová ◽  
Milan Svoboda ◽  
Petr Král ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Aluminium Alloys ◽  
Creep Resistance ◽  
Room Temperature ◽  
Creep Behaviour ◽  
Coarse Grained ◽  
Pure Aluminium ◽  
Creep Tests ◽  
Angular Pressing ◽  
Compression Creep

This paper examines the effect of equal-channel angular pressing (ECAP) on creep behaviour of pure aluminium, binary Al-0.2wt.%Sc alloy and ternary Al-3wt.%Mg-0.2wt.%Sc alloy. The ECAP was conducted at room temperature with a die that had a 90° angle between the channels and 8 repetitive ECAP passes followed route BC. Constant stress compression creep tests were performed at 473 K and stresses ranging between 16 to 80 MPa on ECAP materials and, for comparison purposes, on the initial coarse-grained materials. The results showed that the creep resistance of the ECAP processed Al-Sc and Al-Mg-Sc alloys was markedly deteriorated with respect to unpressed coarse-grained materials.

The Effect of Alloying Elements on Thermal Conductivity of Aluminum Alloys in High Pressure Die Casting

2013 ◽  
Vol 813 ◽  
pp. 175-178 ◽  
Author(s):  
Cheol Woo Kim ◽  
Jae Ik Cho ◽  
Se Weon Choi ◽  
Young Chan Kim
Keyword(s):  
Thermal Conductivity ◽  
Aluminum Alloys ◽  
Die Casting ◽  
Pure Aluminum ◽  
High Thermal Conductivity ◽  
Alloying Elements ◽  
Alloying Element ◽  
Casting Alloys ◽  
Pressure Die Casting ◽  
Effect Of Alloying

Recently, demand of aluminum alloys for manufacturing in components with high thermal conductivity application increases. However, the most aluminum die casting alloys exhibit very lower thermal properties, about only a half of pure aluminum. In die casting alloys, alloying elements are essential to obtain sufficient fluidity and mechanical strength, therefore, in this study, the effect of alloying elements, Si, Cu, Mg, Fe and Mn, on thermal conductivity, die casting characteristics and mechanical properties were analyzed and the appropriate amount of each alloying element were investigated. The results showed that Mn had the most deleterious effect in thermal conductivity and Si and Fe contents were important to improve fluidity and strength. The alloy with 1.5~2.0wt.%Si and 0.6wt.%Fe showed very good combination of high thermal conductivity and sufficient casting characteristics.

Multi-alloying effect of Sc, Zr, Cr on the Al-Mg-Si-Mn high-pressure die casting alloys

2020 ◽  
Vol 168 ◽  
pp. 110537 ◽  
Author(s):  
O. Prach ◽  
O. Trudonoshyn ◽  
P. Randelzhofer ◽  
С. Körner ◽  
K. Durst
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
Alloying Effect ◽  
High Pressure Die Casting ◽  
Casting Alloys ◽  
Pressure Die Casting

Effects of Physical Melt Treatments on Microstructural Evolution and Anodizing Characteristics of Al-Si Casting Alloys

2011 ◽  
Vol 695 ◽  
pp. 243-246 ◽  
Author(s):  
Je Sik Shin ◽  
Bong Hwan Kim ◽  
Sang Mok Lee
Keyword(s):  
Heat Treatment ◽  
High Pressure ◽  
Aluminum Alloys ◽  
Die Casting ◽  
Microstructural Feature ◽  
Casting Alloys ◽  
Melt Treatment ◽  
Twin Screw ◽  
A356 Aluminum ◽  
Pressure Die Casting

In order to investigate the effects of physical melt treatment on microstructural feature and anodizing characteristics of Al-Si system casting alloys, A380 and A356 aluminum alloys were chosen and a twin-screw melt-shearing process was utilized before high pressure die casting. In order to refine and homogenize the microstructure of the diecast Al-Si alloys, the melt-shearing process parameters were controlled and T6 heat treatment was carried out.

Creep Behaviour of Si3N4 Ceramics Sintered with RE2O3

2006 ◽  
Vol 514-516 ◽  
pp. 759-763
Author(s):  
Claudinei dos Santos ◽  
Kurt Strecker ◽  
Francisco Piorino Neto ◽  
Cosme Roberto Moreira Silva ◽  
Flávia A. Almeida ◽  
...  
Keyword(s):  
Solid Solution ◽  
Relative Density ◽  
Creep Behaviour ◽  
Rare Earth Oxide ◽  
Grain Boundary Sliding ◽  
Creep Tests ◽  
Sintering Additive ◽  
Compressive Stresses ◽  
Oxide Solid Solution ◽  
Boundary Sliding

The objective of this work was to evaluate the creep behaviour of Si3N4 based ceramics obtained by uniaxial hot-pressing. As sintering additive, an yttrium-rare earth oxide solid solution, designed RE2O3, that shows similar characteristics to pure Y2O3, was used. Samples were sintered using high-purity α-Si3N4 powder, with additive mixtures based on RE2O3/Al2O3 or RE2O3/AlN, at 5 and 20 vol.%, respectively. The sintered samples were characterized by X-ray diffractometry, scanning electron microscopy and density. Specimens of 3x3x6 mm3 were submitted to creep tests, under compressive stresses between 100 and 350 MPa at temperatures ranging from 1250 to 13750C in air. Samples with RE2O3/Al2O3 showed β-Si3N4 as crystalline phase, with grains of high aspect ratio, and a relative density around 99% of the theoretical density. The Si3N4/RE2O3/AlN samples presented α-Si3N4 solid solution, designed α-SiAlON, with a more equiaxed microstructure and slightly lower relative density (96-98%). The results of creep tests indicated that these ceramics containing α-SiAlON are the more creep resistant, with steady-state creep rates around 10-4 h-1, with stress exponents (n) in the range 0.67-2.53, indicating grain boundary sliding as the main creep mechanism.

Effect of Zr, Cr and Sc on the Al–Mg–Si–Mn high-pressure die casting alloys

2019 ◽  
Vol 759 ◽  
pp. 603-612 ◽  
Author(s):  
O. Prach ◽  
O. Trudonoshyn ◽  
P. Randelzhofer ◽  
С. Körner ◽  
K. Durst
Keyword(s):  
High Pressure ◽  
Die Casting ◽  
High Pressure Die Casting ◽  
Casting Alloys ◽  
Pressure Die Casting

scholarly journals Comparison of the Heat Treatment Response of SSM-HPDC 6082 and 6004 Wrought Alloys with A356 and F357 Casting Alloys

2011 ◽  
Vol 690 ◽  
pp. 53-56 ◽  
Author(s):  
Heinrich Möller ◽  
Gonasagren Govender ◽  
Waldo Stumpf
Keyword(s):  
Heat Treatment ◽  
Artificial Aging ◽  
Die Casting ◽  
Natural Aging ◽  
Solid Metal ◽  
Casting Alloys ◽  
Aging Response ◽  
Semi Solid ◽  
Si Content ◽  
Pressure Die Casting

Semi-solid metal high pressure die casting was used to produce plates from traditional wrought Al-Mg-Si alloys 6082 and 6004, as well as from traditional casting Al-Si-Mg alloys A356 and F357. The high Si-content of the casting alloys offer several advantages, including a faster artificial aging response, higher strength for comparable Mg contents and less sensitivity to prior natural aging on peak strength. However, over-aging occurs earlier in the casting alloys than in the wrought alloys.

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